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A H, WAGON SEAT Lock.

Patent Apr 5 ToR I W %4 ATTO EYS WITNES m UNITED STATES PATENT OFFICE.

EBENEZER H. BOOTH, OF WEST OOLESVILLE, NEW YORK.

WAGON-SEAT LOCK.

SPECIFICATION forming part of Letters Patent No. 256,962, dated April 25, 1882.

Application filed February 21,1882. (No model.)

To all whom it may concern Be it known that I, EBENEZER H. Boorn, a citizen of'the United States, resident of West Oolesville, in the county of Broome and State of New York, have invented a new and valuable Improvementin VVagon-Seat Locks; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is a representation of a side view of my seat-lock. Figs. 2, 3, and 4 are detail views of the same, and Fig. 5 is a vertical sectional view.

This invention has relation to safety-locks or clamps for wagoirseats and other removable parts; and it consists in the construction and novel arrangement of the clamp hook, its grooved shank, the bearingplate, and the scroll-cam, all as hereinafter set forth, and particularly pointed out in the claim.

In the accompanying drawings, the letterA designates the rail or part of the wagon on which the seat rests; and Brepreseuts the riserstandard orother support, loriningapart of the seat, and designed to rest on the rail A.

0 indicates a bearing-plate, which is secured to the seat-riser by means of screws, as at d and 6, one of these screws usually forming the center pivot, on which theoperating-cam turns. The plate 0 is provided with a circular hearing or rim, g, and with a tubular guideway, h. In the latteris placed the shank k ofthe clamphook L, said hook extending downward, and having its bent end or catch adapted to extend under the rail A, and provided with an upturned tip or claw, m, designed to bite into the wood of the rail. The shank 7c is designed to turn in its bearing h, and is grooved at its upper end to engage the operating-cam.

1t designates the cam plate or cap plate, which is formed with a marginal bearing, .9, moving on the rim 9 of the base-plate G, and with a spiral or scroll-form cam or rib, z, to engage the groove or grooves t of the clamphook. The cam-plate is centrallypivoted at e, and is provided with a handle or'handles, w, or with a wrench-seat, whereby it can be turned. ()n the base-plate O is formed a bearing lug or support, 2;, against which the circular edge 8 of the cam-plate works, the lug or hearing serving to relieve the center pivot, e, of strain,

and at the same time act-ing as a frictional stop to prevent the cam-plate from turning backward. As the cam z traverses the groove of the hook-shan k transversely and nearly at right angles to the direction of strain, the tendency to turn the cam backward, and thereby loosen the elamp, is very slight.

This lock has a continuous take-up, and will hold at any point when the cam may by stopped.

its draw or play is sufficient to compensate for any amount of wear of the seat-rail, so that it is always securely and firmly engaged therewith when the cam is properly turned.

Aseat-fastening in which a cam and hook are employed, consistingof an open or skeleton cam and a revolving hook and asocket for the stern of the hook to work in, combined and arranged in such a manner that when the cam is turned the stem of the hook shall move in a line intersecting the axis of the cam and the bearing-point ot' the hook, is not new, and is not broadly claimed herein.

Having described this invention, what I claim, and desire to secure by Letters Patent, 1s-- In a safety-lock, the combination, with the base-plate and its bearings g, IL, and o, of the grooved clamp-hook and the cap-plate having the marginal bearing 8 and the cam-rib 2', substantially as specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

JOHN W. Boo'rH, NOBLE B. LEACH. 

